Preheat grill. Pile 1/4 of the green onions on each of 4 large pieces of heavy-duty aluminum foil. Top each pile of onions with a chicken breast, 1/4 of the pineapple chunks and 1/4 of the red pepper strips.

In a cup, stir together the teriyaki sauce, brown sugar and ginger (if using); spoon mixture evenly into each packet.

Fold up packets. Grill packets over medium-high heat, covered, for 14 to 16 minutes. Open carefully, season with pepper and serve.

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